Since 1947 OSPHO has been ordered and reordered as a phosphoric rust converter for boats, refineries, fleets, railroads, and automotive restoration—wherever you need metal prep before painting.
Before & After | Quart Size | Gallon Size | 5 Gallon | Media
OSPHO also helps with home maintenance—gutters, fences, buildings, fire escapes, sash, and roofs—any metal surface where you need rust treatment before topcoat.
Rust converter vs. rust remover: OSPHO is a metal treatment that converts rust for painting; Rust-i-cide is formulated to remove rust and prepare surfaces. Both are used in marine, automotive, farm equipment, and DIY projects—see safety data sheets (SDS) and technical PDFs on each product page.
Rust-i-cide is a trusted rust remover to strip corrosion and prepare metal for paint—different from a rust converter: use it when you need rust removed from chrome, hardware, enamel, and more.